Parking in a suspended bay is no frivolous mistake for your average Londoner. Those who break the suspension order, which is normally used when buildings need maintenance work or debris removed, face a £44 fine if caught.

Fortunately for Goldsmith, the suspension in this case doesn't kick in until 24 April, but there's been much speculation over the skills of his bus driver. Earlier this month the campaign bus was caught on camera appearing to run a red light.

A spokesperson for Goldsmith's campaign told local reporters at the time that the mayoral hopeful takes the highway code "extremely seriously", and argued that the bus was passing through the crossing while the light was still green.

Goldsmith was also left red-faced this month after a BBC interview in the back of a black cab on London's tube network went awry.

The Conservative London mayoral candidate was asked by the BBC's assistant political editor Norman Smith to name the station that came after the sequence "Bond Street, Oxford Circus, Tottenham Court Road..."

Failing to give the correct answer of Holborn, Goldsmith side-stepped the question with the answer: "Most people have a route or two routes and they become like an extension of the body. But for me when it's outside the norm you have apps like Citymapper which you rely on every day."